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Articles 61 - 64 of 64
Full-Text Articles in Social and Behavioral Sciences
Sea Surface Temperature And Chlorophyll-A Spatial-Temporal Variation Using Modis-Aqua In The Todos Os Santos Bay, Bahia, Brazil, Rafael Cabral Carvalho, Carlos A. Lentini
Sea Surface Temperature And Chlorophyll-A Spatial-Temporal Variation Using Modis-Aqua In The Todos Os Santos Bay, Bahia, Brazil, Rafael Cabral Carvalho, Carlos A. Lentini
Faculty of Science, Medicine and Health - Papers: part A
In this study, the importance of MODIS sensor multispectral imagery on monitoring coastal and oceanic areas as well as marine ecosystems is demonstrated. As an example, the Todos os Santos Bay (TSB), BA, Brazil, was selected. Four 250m Sea Surface Temperature and Chlorophyll-a satellite-derived images were processed to characterize the TSB in 2009, as well as monthly time-series from July 2002 to January 2010 and monthly maps of 2009 off the coast of Bahia. These results were compared to the Brazilian Water Agency (ANA) discharge data and tidal data. They showed the importance of the latter in physical forcing compared …
Observation Of Unstable Fast Component In Osl Of Quartz, Anchuan Fan, Sheng-Hua Li, Bo Li
Observation Of Unstable Fast Component In Osl Of Quartz, Anchuan Fan, Sheng-Hua Li, Bo Li
Faculty of Science, Medicine and Health - Papers: part A
Optically stimulated luminescence (OSL) dating has been applied to quartz grains extracted from a sedimentary layer containing stone tools from the bank of Salawusu River, Mu Us desert in central China. Severe age underestimation was observed by applying the single-aliquot regenerative dose (SAR) dating method when compared with the isochron infrared stimulated luminescence (iIRSL) dating results using potassium-rich feldspar grains of different grain sizes. Preheating plateau and dose recovery tests suggest that the SAR protocol is robust for this sample. Component resolving indicates that the OSL signals were dominated by the fast component. However, the fast component is thermally unstable …
Isochron Dating Of Sand-Loess-Soil Deposits From The Mu Us Desert Margin, Central China, Bo Li, Sheng-Hua Li, Jimin Sun
Isochron Dating Of Sand-Loess-Soil Deposits From The Mu Us Desert Margin, Central China, Bo Li, Sheng-Hua Li, Jimin Sun
Faculty of Science, Medicine and Health - Papers: part A
A sand-loess-soil sequence from the margin of the Mu Us Desert was studied using the isochron infrared stimulated luminescence (IRSL) dating method utilizing K-feldspar grains extracted from sediments. Although the IRSL ages measured with the conventional method showed underestimation as a result of anomalous fading, the isochron results are broadly consistent with independent ages based on stratigraphic correlation in a glacial/interglacial scale over the last 250 ka. For samples older than 250 ka, the IRSL signals approached in field saturation and the isochron dating gave ambiguous results, suggesting an age limit for the method.
Nutritional Ecology Of Essential Fatty Acids: An Evolutionary Perspective, Anthony J. Hulbert, Sarah K. Abbott
Nutritional Ecology Of Essential Fatty Acids: An Evolutionary Perspective, Anthony J. Hulbert, Sarah K. Abbott
Faculty of Science, Medicine and Health - Papers: part A
There are four types of fatty acids but only two types are essential nutritional requirements for many animals. These are the omega-6 polyunsaturated fatty acids (n-6 PUFA) and the omega-3 polyunsaturated fatty acids (n-3 PUFA) and because they cannot be converted to one another they are separate essential dietary requirements. They are only required in small amounts in the diet and their biological importance stems largely from their role as constituents of membrane lipids. They are synthesised by plants and, as a generalisation, green leaves are the source of n-3 PUFA while seeds are the source of n-6 PUFA in …